Isekai Kara no Kikan-sha

At the age of 25, Kaburagi Shuu was transported to another world. However, he was not like the hero of the story. Despite his advantages, for some reason he had no memory of meeting God, nor did he play any role to do anything. He just survived in a harsh world. Then, eight years passed, and Shuu finally returned back. However, it was not the day when he was 25 years old, but a day when he was still 17 years old. Now, having been changed by the experience in another world, Shuu decides to live unrestrainedly in his original world…